Steam or gas turbine.



No. 777,865. PATENTED DEC. 20, 1904. J. STUMPP.

STEAM OR GAS TURBINE.

APPLICATION 11.21) SEPT. a. 1903.

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Patented December 20, 1904.

UNITED STATES PATENT OEEIcE.

JOHANN STUMPF, OF OI-IARLOTTENBURG, GERh IANY, ASSIGNOR TO GEN- ERALELECTRIC COMPANY, A CORPORATION OF NEIV YORK.

STEAM OR GAS TURBINE.

SPECIFICATION forming part of Letters Patent No. 777,865, dated December20, 1904.

' Application filed September 8, 1903. Serial No- 172,2 I5.

To all whom it Wbay concern.-

Be it known that I, J OHANN STUMPE, a subject of the King of Prussia,German Emperor,

and a resident of 27 Rankestrasse, Oharlottenburg, near Berlin, Kingdomof Prussia, German Empire, have invented certain new and usefulImprovements in Steam or Gas Turbines, of which the following is anexact specification.

My invention relates to improvements in steam or gas turbines, and moreespecially to a turbine for drivingtwo dynamos of different size.

It often occurs in practice that two dynamos of different size are to bedriven, so, for instance, in case one dynamo is sufficient for thenormal work to be done in a factory it is mostly advantageous to have asmall additional dynamo, which is only used in case the work to be donesurpasses the normal limits. It also often occurs that two differentdynan1os as, for instance, an alternating-current dynamo and acontinuous-current dynamo or a synchronous and an asynchronous dynamoare necessary. In all these cases it is advantageous to drive the twodynamos, by means of asteam or gas turbine, with two turbine-wheelsrotating in opposite direction, one of which wheels is impinged upon byfresh steam, while the other one is fed by the exhaust-steam of thefirst one. In such turbines the primary Wheel that is, the wheelimpinged upon by fresh steamhas always a greater useful effect than thesecondary Wheel. I therefore construct my turbine in such manner thatthe primary turbine-Wheel is coupled with the larger dynamo and thesecondary wheel with the smaller dynamo. In order to make this moreclear, I refer to the accompanying drawing, .which shows a scheme of theconstruction forming the object of my invention.

In the drawing, a is the primary turbinewheel.

6 represents the steam-admission nozzles.

0 is the secondary turbine-wheel.

The primary turbine-wheel a is fixed to a tubular shaft cl, and thesecondary turbinewheel 0 is fixed to a shaft 0, situated within thetubular shaft (Z. To the tubular shaft d the larger dynamo f is coupled,while the smaller dynamo is driven by means of the shaft 0. The mainidea of the invention consists in having both dynamo-machines situatedupon one side of the turbine, hereby attaining that the turbine-wheelscan easily be reached by taking off the cover 71 of the turbine-casing2'.

As mentioned above, the invention is ad vantageously used in case analternating-current dynamo and a continuous-current dynamo are to bedriven, in which case the alternating-current dynamo, which, aswellknown, can rotate with high speed, is coupled to the primaryturbinewheel, whereas the continuous current dynamo, the speed of whichmust be smaller on account of the construction of the armature, thewindings of which do not allow high speeds, is coupled with thesecondary turbine-wheel.

It will be understood that the dynamo f may be an asynchronousalternating-current dynamo and the dynamo g a synchronousalternating-current dynamo. On account of both dynamos being situated onone side of the turbine the construction may advantageously be used incase a condenser is to be connected to the turbine, in which case thecondenser can be directly fixed to the cover 7b of the turbinecasing.

Having thus fully described the nature of my invention, whatI desire tosecure by Letters Patent of the United States is- 1. In a steam or gasturbine for driving dynamos, the combination of two turbine-wheelsrotating in opposite directions, one of said wheels being impinged uponby fresh elastic fluid, the second one beingimpinged upon by the exhaustfluid of the first one, with a tubular shaft to which one of theturbine-wheels is fixed, and a second shaft to which the otherturbine-wheel is fixed, said second shaft being situated within saidtubular shaft, a dynamo, directly coupled to the shaft of theturbine-wheel impinged upon by fresh fluid, and a second dynamo directlycoupled to the shaft of the second turbine-wheel, substantially asdescribed and for the purpose set forth.

2. In a steam or gas turbine for driving dynames, the combination of twoturbine-wheels rotating in opposite directions, one of said wheels beingimpinged upon by fresh steam, the second one being impinged upon by the5 exhaust-steam of the first one, with a tubular shaft to which one ofthe turbine-wheels is fixed, and a second shaft to which the otherturbine-wheel is fixed, said second shaft being situated within saidtubular shaft, a dynamo "of given capacity directly coupled to the shaftof the turbine-Wheel impinged upon by fresh steam, and a dynamo ofsmaller capacity directly coupled to the shaft of the secondturbine-wheel, substantially as described and for I 5 the purposesetforth.

2O shafts for said turbine-wheels and dynamos coupled to said shafts,substantially as described.

I. In a steam or gas turbine for driving dynamos, the combination of twoturbine-wheels 5 rotating in opposite directions, means for supplyingmotive fluid to one wheel, the second wheel being impinged upon by theexhaust fluid of the first, separate shafts for said turbine-wheels, adynamo coupled to the shaft of the first turbine-wheel, and a second dynamo coupled to the shaft of the second turbinewheel, substantially asdescribed.

5. In a steam or gas turbine, the combination of two turbine-Wheels,means for supplying motive fluid to said wheels, a shaft for each wheel,and a dynamo coupled to each shaft,substantially as described.

6. In a steam or gas turbine, the combination of a plurality ofturbine-wheels, means for supplying elastic fluid to said wheels, ashaft for each wheel, and a dynamo coupled to each. shaft substantiallyas described.

In testimony whereof I have signed my name to this specification in thepresence of two sul scribing witnesses.

JOHANN STUMPF.

IVitnesses:

HENRY HASPER, IVOLDEMAR HAUPT,

